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Fig. 1. The classical pathway of PKC activation. The scheme illustrates the production of the immediate precursor lipid PtdIns(4,5)P2 from its parent lipid PtdIns. Various agonists are linked to the phospholipases (PtdIns-PLC) that can cleave PtdIns(4,5)P2 to diacylglycerol (DAG) and the calcium mobilizer Ins(1,4,5)P3. Calcium can affect the cPKC class by promoting membrane recruitment, but the key allosteric activator at the membrane for both cPKC and nPKC isotypes is DAG.
